/*
 * Copyright (c) 2021 Raspberry Pi (Trading) Ltd.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

#include <stdio.h>
#include <math.h>

#include "pico.h"
#include "pico/stdlib.h"

//#include "VGA_t4.h"
#include "vga_t_dma.h"
VGA_T4 vga;


const vga_pixel mario[]  = {
0x00,0x00,0x00,0x00,0x00,0x00,0x24,0x24,0x24,0x24,0x24,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x24,0x24,0xe5,0xe1,0xe9,0xf9,0xe9,0x24,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x24,0xe1,0xe1,0xa1,0xa1,0xd0,0xf9,0xff,0x24,0x00,0x00,0x00,0x00,
0x00,0x00,0x24,0xa1,0xe5,0xa1,0x81,0x24,0x24,0x24,0x24,0x24,0x24,0x00,0x00,0x00,
0x00,0x24,0xa5,0xa1,0x81,0x24,0x24,0x24,0x24,0x24,0x24,0x24,0x24,0x24,0x00,0x00,
0x00,0x24,0xf6,0x24,0x24,0x44,0xe9,0x24,0xe9,0x24,0xed,0x00,0x00,0x00,0x00,0x00,
0x24,0xf6,0x8d,0xf6,0x24,0xe9,0xf6,0x24,0xf6,0x24,0xf6,0x8d,0x6c,0x00,0x00,0x00,
0x24,0xe9,0x88,0xf6,0x24,0x24,0xfa,0xf6,0xfa,0xf6,0xfa,0xf6,0xf6,0x68,0x00,0x00,
0x24,0x40,0xe9,0xf6,0x24,0xf6,0xf6,0x44,0xe9,0xed,0xe9,0xed,0xe9,0x68,0x00,0x00,
0x00,0x24,0x40,0xe9,0xed,0xf6,0x44,0x20,0x20,0x20,0x20,0x20,0x24,0x00,0x00,0x00,
0x00,0x00,0x24,0x84,0xe9,0xe9,0xe9,0xe9,0x20,0x24,0x24,0x24,0x00,0x00,0x00,0x00,
0x00,0x00,0x68,0x81,0x84,0x84,0x88,0x88,0x68,0x29,0x24,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x68,0xa5,0xa5,0xe9,0x68,0x4e,0x7a,0x7a,0x29,0x24,0x24,0x00,0x00,0x00,
0x00,0x24,0x68,0xff,0xff,0xff,0x8d,0xff,0xff,0x9b,0xff,0x49,0x24,0x24,0x00,0x00,
0x24,0x64,0x88,0xff,0xff,0x8d,0x4e,0xff,0xff,0x9b,0xff,0x24,0x88,0x88,0x24,0x00,
0x88,0x88,0x68,0xff,0xff,0x68,0x2e,0x4e,0x52,0x7a,0x29,0x20,0x88,0x88,0x24,0x00,
0x88,0x88,0x49,0x68,0x6c,0x2e,0x2e,0x2e,0x2e,0x09,0x00,0x88,0x88,0x88,0x00,0x00,
0x24,0x88,0x88,0x24,0x24,0x09,0x05,0x05,0x09,0x24,0x24,0x88,0x88,0x24,0x00,0x00,
0x00,0x24,0x24,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x24,0x24,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00};

static const unsigned char tilemapL0[] = {
  0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,
  0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,
  0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,
  0x04,0x04,0x04,0x04,0x04,0x04,0x04,0x04,0x04,0x04,0x04,0x04,0x04,0x04,0x04,0x04,0x04,0x04,0x04,0x04,0x04,0x04,0x04,0x04,0x04,0x04,0x04,0x04,0x04,0x04,
  0x05,0x05,0x05,0x05,0x05,0x05,0x05,0x05,0x05,0x05,0x05,0x05,0x05,0x05,0x05,0x05,0x05,0x05,0x05,0x05,0x05,0x05,0x05,0x05,0x05,0x05,0x05,0x05,0x05,0x05,
  0x06,0x06,0x06,0x06,0x06,0x06,0x06,0x06,0x06,0x06,0x06,0x06,0x06,0x06,0x06,0x06,0x06,0x06,0x06,0x06,0x06,0x06,0x06,0x06,0x06,0x06,0x06,0x06,0x06,0x06,
  0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,
  0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,
  0x09,0x09,0x09,0x09,0x09,0x09,0x09,0x09,0x09,0x09,0x09,0x09,0x09,0x09,0x09,0x09,0x09,0x09,0x09,0x09,0x09,0x09,0x09,0x09,0x09,0x09,0x09,0x09,0x09,0x09,
  0x0A,0x0A,0x0A,0x0A,0x0A,0x0A,0x0A,0x0A,0x0A,0x0A,0x0A,0x0A,0x0A,0x0A,0x0A,0x0A,0x0A,0x0A,0x0A,0x0A,0x0A,0x0A,0x0A,0x0A,0x0A,0x0A,0x0A,0x0A,0x0A,0x0A,
  0x0B,0x0B,0x0B,0x0B,0x0B,0x0B,0x0B,0x0B,0x0B,0x0B,0x0B,0x0B,0x0B,0x0B,0x0B,0x0B,0x0B,0x0B,0x0B,0x0B,0x0B,0x0B,0x0B,0x0B,0x0B,0x0B,0x0B,0x0B,0x0B,0x0B,
  0x0C,0x0C,0x0C,0x0C,0x0C,0x0C,0x0C,0x0C,0x0C,0x0C,0x0C,0x0C,0x0C,0x0C,0x0C,0x0C,0x0C,0x0C,0x0C,0x0C,0x0C,0x0C,0x0C,0x0C,0x0C,0x0C,0x0C,0x0C,0x0C,0x0C,
  0x0D,0x0D,0x0D,0x0D,0x0D,0x0D,0x0D,0x0D,0x0D,0x0D,0x0D,0x0D,0x0D,0x0D,0x0D,0x0D,0x0D,0x0D,0x0D,0x0D,0x0D,0x0D,0x0D,0x0D,0x0D,0x0D,0x0D,0x0D,0x0D,0x0D,
  0x0E,0x0E,0x0E,0x0E,0x0E,0x0E,0x0E,0x0E,0x0E,0x0E,0x0E,0x0E,0x0E,0x0E,0x0E,0x0E,0x0E,0x0E,0x0E,0x0E,0x0E,0x0E,0x0E,0x0E,0x0E,0x0E,0x0E,0x0E,0x0E,0x0E,
  0x0F,0x0F,0x0F,0x0F,0x0F,0x0F,0x0F,0x0F,0x0F,0x0F,0x0F,0x0F,0x0F,0x0F,0x0F,0x0F,0x0F,0x0F,0x0F,0x0F,0x0F,0x0F,0x0F,0x0F,0x0F,0x0F,0x0F,0x0F,0x0F,0x0F,
  0x10,0x10,0x10,0x10,0x10,0x10,0x10,0x10,0x10,0x10,0x10,0x10,0x10,0x10,0x10,0x10,0x10,0x10,0x10,0x10,0x10,0x10,0x10,0x10,0x10,0x10,0x10,0x10,0x10,0x10,
  0x11,0x11,0x11,0x11,0x11,0x11,0x11,0x11,0x11,0x11,0x11,0x11,0x11,0x11,0x11,0x11,0x11,0x11,0x11,0x11,0x11,0x11,0x11,0x11,0x11,0x11,0x11,0x11,0x11,0x11,
  0x12,0x12,0x12,0x12,0x12,0x12,0x12,0x12,0x12,0x12,0x12,0x12,0x12,0x12,0x12,0x12,0x12,0x12,0x12,0x12,0x12,0x12,0x12,0x12,0x12,0x12,0x12,0x12,0x12,0x12,
  0x13,0x13,0x13,0x13,0x13,0x13,0x13,0x13,0x13,0x13,0x13,0x13,0x13,0x13,0x13,0x13,0x13,0x13,0x13,0x13,0x13,0x13,0x13,0x13,0x13,0x13,0x13,0x13,0x13,0x13,
  0x14,0x14,0x14,0x14,0x14,0x14,0x14,0x14,0x14,0x14,0x14,0x14,0x14,0x14,0x14,0x14,0x14,0x14,0x14,0x14,0x14,0x14,0x14,0x14,0x14,0x14,0x14,0x14,0x14,0x14,
  0x15,0x15,0x15,0x15,0x15,0x15,0x15,0x15,0x15,0x15,0x15,0x15,0x15,0x15,0x15,0x15,0x15,0x15,0x15,0x15,0x15,0x15,0x15,0x15,0x15,0x15,0x15,0x15,0x15,0x15,
  0x16,0x16,0x16,0x16,0x16,0x16,0x16,0x16,0x16,0x16,0x16,0x16,0x16,0x16,0x16,0x16,0x16,0x16,0x16,0x16,0x16,0x16,0x16,0x16,0x16,0x16,0x16,0x16,0x16,0x16,
  0x17,0x17,0x17,0x17,0x17,0x17,0x17,0x17,0x17,0x17,0x17,0x17,0x17,0x17,0x17,0x17,0x17,0x17,0x17,0x17,0x17,0x17,0x17,0x17,0x17,0x17,0x17,0x17,0x17,0x17,
  0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18,
  0x19,0x19,0x19,0x19,0x19,0x19,0x19,0x19,0x19,0x19,0x19,0x19,0x19,0x19,0x19,0x19,0x19,0x19,0x19,0x19,0x19,0x19,0x19,0x19,0x19,0x19,0x19,0x19,0x19,0x19,
  0x1A,0x1A,0x1A,0x1A,0x1A,0x1A,0x1A,0x1A,0x1A,0x1A,0x1A,0x1A,0x1A,0x1A,0x1A,0x1A,0x1A,0x1A,0x1A,0x1A,0x1A,0x1A,0x1A,0x1A,0x1A,0x1A,0x1A,0x1A,0x1A,0x1A,
  0x1B,0x1B,0x1B,0x1B,0x1B,0x1B,0x1B,0x1B,0x1B,0x1B,0x1B,0x1B,0x1B,0x1B,0x1B,0x1B,0x1B,0x1B,0x1B,0x1B,0x1B,0x1B,0x1B,0x1B,0x1B,0x1B,0x1B,0x1B,0x1B,0x1B,
  0x1C,0x1C,0x1C,0x1C,0x1C,0x1C,0x1C,0x1C,0x1C,0x1C,0x1C,0x1C,0x1C,0x1C,0x1C,0x1C,0x1C,0x1C,0x1C,0x1C,0x1C,0x1C,0x1C,0x1C,0x1C,0x1C,0x1C,0x1C,0x1C,0x1C,
  0x1D,0x1D,0x1D,0x1D,0x1D,0x1D,0x1D,0x1D,0x1D,0x1D,0x1D,0x1D,0x1D,0x1D,0x1D,0x1D,0x1D,0x1D,0x1D,0x1D,0x1D,0x1D,0x1D,0x1D,0x1D,0x1D,0x1D,0x1D,0x1D,0x1D,
  0x1E,0x1E,0x1E,0x1E,0x1E,0x1E,0x1E,0x1E,0x1E,0x1E,0x1E,0x1E,0x1E,0x1E,0x1E,0x1E,0x1E,0x1E,0x1E,0x1E,0x1E,0x1E,0x1E,0x1E,0x1E,0x1E,0x1E,0x1E,0x1E,0x1E,
  0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,
  0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
  0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,
  0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,
  0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,
  0x04,0x04,0x04,0x04,0x04,0x04,0x04,0x04,0x04,0x04,0x04,0x04,0x04,0x04,0x04,0x04,0x04,0x04,0x04,0x04,0x04,0x04,0x04,0x04,0x04,0x04,0x04,0x04,0x04,0x04,
  0x05,0x05,0x05,0x05,0x05,0x05,0x05,0x05,0x05,0x05,0x05,0x05,0x05,0x05,0x05,0x05,0x05,0x05,0x05,0x05,0x05,0x05,0x05,0x05,0x05,0x05,0x05,0x05,0x05,0x05,
  0x06,0x06,0x06,0x06,0x06,0x06,0x06,0x06,0x06,0x06,0x06,0x06,0x06,0x06,0x06,0x06,0x06,0x06,0x06,0x06,0x06,0x06,0x06,0x06,0x06,0x06,0x06,0x06,0x06,0x06,
  0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,
  0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,0x08,
  0x09,0x09,0x09,0x09,0x09,0x09,0x09,0x09,0x09,0x09,0x09,0x09,0x09,0x09,0x09,0x09,0x09,0x09,0x09,0x09,0x09,0x09,0x09,0x09,0x09,0x09,0x09,0x09,0x09,0x09,
  0x0A,0x0A,0x0A,0x0A,0x0A,0x0A,0x0A,0x0A,0x0A,0x0A,0x0A,0x0A,0x0A,0x0A,0x0A,0x0A,0x0A,0x0A,0x0A,0x0A,0x0A,0x0A,0x0A,0x0A,0x0A,0x0A,0x0A,0x0A,0x0A,0x0A,
  0x0B,0x0B,0x0B,0x0B,0x0B,0x0B,0x0B,0x0B,0x0B,0x0B,0x0B,0x0B,0x0B,0x0B,0x0B,0x0B,0x0B,0x0B,0x0B,0x0B,0x0B,0x0B,0x0B,0x0B,0x0B,0x0B,0x0B,0x0B,0x0B,0x0B,
  0x0C,0x0C,0x0C,0x0C,0x0C,0x0C,0x0C,0x0C,0x0C,0x0C,0x0C,0x0C,0x0C,0x0C,0x0C,0x0C,0x0C,0x0C,0x0C,0x0C,0x0C,0x0C,0x0C,0x0C,0x0C,0x0C,0x0C,0x0C,0x0C,0x0C,
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  0x1C,0x1C,0x1C,0x1C,0x1C,0x1C,0x1C,0x1C,0x1C,0x1C,0x1C,0x1C,0x1C,0x1C,0x1C,0x1C,0x1C,0x1C,0x1C,0x1C,0x1C,0x1C,0x1C,0x1C,0x1C,0x1C,0x1C,0x1C,0x1C,0x1C,
  0x1D,0x1D,0x1D,0x1D,0x1D,0x1D,0x1D,0x1D,0x1D,0x1D,0x1D,0x1D,0x1D,0x1D,0x1D,0x1D,0x1D,0x1D,0x1D,0x1D,0x1D,0x1D,0x1D,0x1D,0x1D,0x1D,0x1D,0x1D,0x1D,0x1D,
  0x1E,0x1E,0x1E,0x1E,0x1E,0x1E,0x1E,0x1E,0x1E,0x1E,0x1E,0x1E,0x1E,0x1E,0x1E,0x1E,0x1E,0x1E,0x1E,0x1E,0x1E,0x1E,0x1E,0x1E,0x1E,0x1E,0x1E,0x1E,0x1E,0x1E,
  0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,
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};

static const unsigned char tilemapL1[] = {
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};



// Hight of the tile map (size of 1 row above)
#define TILEMAP_H  30

// Only uses rows 3-11 from the TILEMAP_H above for the horizintal scroll
#define HSCR_BEG   3
#define HSCR_END   11

static int fb_width, fb_height;

static unsigned char * tilemapL0Pt;
static unsigned char * tilemapL1Pt;
static int tilemapL0Width;
static int tilemapL1Width;
static int hscrL0    = 0;
static int hscrL1    = 0;
static int hscrincL0 = 1;
static int hscrincL1 = 2;
static uint8_t spr_angle[SPRITES_MAX];



int main(void) {
    stdio_init_all();

    vga.begin(VGA_MODE_320x240);
    //puts("Color bars ready, press SPACE to invert...");
    vga.clear(VGA_RGB(0xff,0x00,0x00));
    vga.get_frame_buffer_size(&fb_width, &fb_height); 
    // Initialize game engine
    // 2 tiles layers (TILES_MAX_LAYERS)
    // 32 sprites (SPRITES_MAX)
    // 64 tiles + 64 sprites definitions
    // Defaults or change VGA_t4.h:
    // 20x15 tiles of 16x16 pixels in 256 colors 
    // 16x32 pixels sprites in 256 colors 
    vga.begin_gfxengine(2, 64, 64);

    // Init tilemaps for entire screen
    tilemapL0Pt= (unsigned char *)&tilemapL0[0];
    tilemapL1Pt= (unsigned char *)&tilemapL1[0];
    for (int c=0; c< TILES_COLS; c++) {
     vga.tile_draw_col(0, c,0,tilemapL0Pt,TILEMAP_H); 
     vga.tile_draw_col(1, c,0,tilemapL1Pt,TILEMAP_H); 
     tilemapL0Pt += TILEMAP_H;
     tilemapL1Pt += TILEMAP_H;
    }
    tilemapL0Width = ((sizeof(tilemapL0)/TILEMAP_H)-TILES_COLS+1)*TILES_W;
    tilemapL1Width = ((sizeof(tilemapL1)/TILEMAP_H)-TILES_COLS+1)*TILES_W;

    // Init horizontal scrolling area, mask last col (in pixels) at right to hide updates
    vga.set_hscroll(0, HSCR_BEG,HSCR_END,TILES_W);
    vga.set_hscroll(1, HSCR_BEG,HSCR_END,TILES_W);

    // Init sprite animation
    for (int i=0; i<SPRITES_MAX; i++)
    {
        spr_angle[i] += (255*i)/SPRITES_MAX;
    }

    vga.sprite_data(0, (vga_pixel *)mario, SPRITES_W*SPRITES_H);
   
    while (true) {     
        hscrL0 = hscrL0 + hscrincL0;
        if ( (hscrL0 & TILES_HMASK) == 0x0) {
        int updcolL0 = (hscrL0 >> TILES_HBITS) % TILES_COLS;
        if (hscrincL0>0) {
          vga.tile_draw_col(0, (updcolL0+(TILES_COLS-1))%TILES_COLS,HSCR_BEG,tilemapL0Pt+HSCR_BEG,HSCR_END-HSCR_BEG+1); 
          tilemapL0Pt += TILEMAP_H;
          if (hscrL0 >= tilemapL0Width) { 
            hscrincL0 = -hscrincL0;
            vga.tile_draw_col(0, (updcolL0+(TILES_COLS-1))%TILES_COLS,HSCR_BEG,tilemapL0Pt-(TILES_COLS+1)*TILEMAP_H+HSCR_BEG,HSCR_END-HSCR_BEG+1); 
          }
        }
        else if (hscrincL0<0) {
          updcolL0 -= 1; // row before !!!
          if (updcolL0<0 ) updcolL0 += TILES_COLS;
          if (( tilemapL0Pt-(TILES_COLS+2)*TILEMAP_H) >= tilemapL0)
            vga.tile_draw_col(0, updcolL0,HSCR_BEG,tilemapL0Pt-(TILES_COLS+2)*TILEMAP_H+HSCR_BEG,HSCR_END-HSCR_BEG+1); 
          tilemapL0Pt -= TILEMAP_H; 
          if (hscrL0 <=0)  { 
            hscrincL0 = -hscrincL0; 
            vga.tile_draw_col(0, updcolL0,HSCR_BEG,tilemapL0Pt-TILEMAP_H+HSCR_BEG,HSCR_END-HSCR_BEG+1); 
          }
        }
        }    
        vga.hscroll(0,hscrL0);

        hscrL1 = hscrL1 + hscrincL1;
        if ( (hscrL1 & TILES_HMASK) == 0x0) {
        int updcolL1 = (hscrL1 >> TILES_HBITS) % TILES_COLS;
        if (hscrincL1 > 0) {
          vga.tile_draw_col(1, (updcolL1+(TILES_COLS-1))%TILES_COLS,HSCR_BEG,tilemapL1Pt+HSCR_BEG,HSCR_END-HSCR_BEG+1); 
          tilemapL1Pt += TILEMAP_H;
          if (hscrL1 >= tilemapL1Width) { 
            hscrincL1 = -hscrincL1;
            vga.tile_draw_col(1, (updcolL1+(TILES_COLS-1))%TILES_COLS,HSCR_BEG,tilemapL1Pt-(TILES_COLS+1)*TILEMAP_H+HSCR_BEG,HSCR_END-HSCR_BEG+1); 
          }
        }
        else if (hscrincL1 < 0) {
          updcolL1 -= 1; // row before !!!
          if (updcolL1<0 ) updcolL1 += TILES_COLS;
           if (( tilemapL1Pt-(TILES_COLS+2)*TILEMAP_H) >= tilemapL1)
            vga.tile_draw_col(1, updcolL1,HSCR_BEG,tilemapL1Pt-(TILES_COLS+2)*TILEMAP_H+HSCR_BEG,HSCR_END-HSCR_BEG+1); 
          tilemapL1Pt -= TILEMAP_H; 
          if (hscrL1 <=0)  { 
            hscrincL1 = -hscrincL1; 
            vga.tile_draw_col(1, updcolL1,HSCR_BEG,tilemapL1Pt-TILEMAP_H+HSCR_BEG,HSCR_END-HSCR_BEG+1); 
          }
        }
        }    
        vga.hscroll(1,hscrL1);


        for (int i=1; i<SPRITES_MAX; i++)
        {
            spr_angle[i] += 1;
            vga.sprite(i, 150+160*calcco[(spr_angle[i]*360)>>8], 100+120*calcsi[(spr_angle[i]*360)>>8], i);
        }
        vga.sprite(0, 100, 100, 0);

        vga.run_gfxengine();

        int c = getchar_timeout_us(0);
        switch (c) {
            case ' ':
                printf("Inverted: %d\n", 1);
                break;
        }
    }
}